On Mon, May 5, 2025 at 01:03 PM, Per wrote:
I want to do something like add MOS=IPB107N20N3 in the PARAMS section on the Navigate/Edit Schematic Block but it moans at me about not being able to resolve the parameter.
Then it appears you know how to add .PARAMs to your symbol already.? That wasn't clear, because the uploaded symbol does not have any parameters added to it yet.
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However, if you are using anything before the latest versions of LTspice, parameter values must be numeric only, so attempting to do a parameter assignment "MOS=IPB107N20N3" will fail, unless IPB107N20N3 is another parameter whose value is numeric.? The rest of this message is for people who are not running the latest version of LTspice.
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You can still use PARAMs to change or set the model of a transistor, by defining the transistor models with numeric names.? For example:
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.SUBCKT IPB107N20N3_L0 drain gate source ...
...
.ENDS
...
.SUBCKT AnotherFET drain gate source
...
.ENDS
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.model 1 AKO: IPB107N20N3_L0
.model 2 AKO: AnotherFET
.model 3 AKO: ...
...
.PARAM MOS=1
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But don't forget that both NMOS symbols inside your "bimos.asc" schematic must have their Prefix values changed from "MN" to "X", to make them work with that Infineon SPICE model which is a .SUBCKT model.? Also, if you use the Infineon model named just "IPB107N20N3", that model requires a special MOSFET symbol with 5 pins.? I hope you are aware of how those models are supposed to work.
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Andy
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